Very good for the price. Sturdy frame and panels. Silicone along the roof panels will keep them in place.

I am not happy with the window vent. In order for the window to stay closed I have to zip tie the hinge. I'm concerned the wind is going to blow the vent backwards

We have no greenhouse 3 weeks later, and we’re told it’s the vendors fault with no resolve as to when we might actually see the product we paid over $650 for. Very disappointing Tractor Supply Company

Very flimsy. The instructions were missing information; for example, in order for the two support beams (18A and 18B) to line up properly with the drill holes for the crossbar at the bottom of the two vents, the instructions should have been noted that they had a specific polarity. They did not, and we had to tear apart two different sections in order to correct. The instructions also don't tell you which grove along the ridge bar to insert the vent panels. It also doesn't mention that the two vents will always have an air gap on the two sides. We are going to have to apply silicone strips to every seam as this will not hold up during our winter months. We will no doubt have to continuously monitor the snow load amounts to avoid collapse; however, we're concerned that it will collapse anyway. THIS IS NOT A STURDY STRUCTURE. It's very expensive for the type of materials it's made of, and you have to build a very level platform as a base first (additional work and cost), and the flimsiness of the greenhouse itself will drive you crazy as you try your best to assemble it. You will need at least two people, and be sure to let everyone involved know, never to press on any of the panels as they are the plastic version of a corrugated cardboard box where it will leave permanent imprints. There are some positives that I can share -- while it was a longer-than-expected delivery time (as it came across the US from LA), the packaging was intact, and each panel was protected on both sides with peel-off film. It also had all of the pieces and nothing in the packaging was damaged. It's a lot of money and a lot of effort for what I believe will be a short-lived lifespan. I hope I'm wrong about the lifespan since we will be storing some sapling arborvitaes to get them through the winter, and I hate the thought of waking up one morning and finding them crushed by a collapsed greenhouse. We have it, it's erected now, we're going to use it, but I cannot recommend this product.